Personally, I would like to see the 12th class go to 2 cell LiPo because it would not require changing a bunch of stuff on our cars. The 2 cell 21.5 BL class is one of the smartest things that's happened in oval racing in a long time and the roadcourse guys should look at what's working already.
Changing to a smaller motor will require a lot of changes and equipment. You'll need a new speedo and motor of course. But, there's also the new pod plate(s) and possibly new pinions for the motor. It all adds up.